Abstract: The main characteristics of the Pearl River estuary′s tidal current and its sediment physical model are introduced in this paper.Based on the experiments of fixed bed,local movable bed and suspended sediment deposition,the evolution of the Lingdingyang beach after completion of the Hong Kong-Zhuhai-Macao Bridge is studied.The results show that the flood control and drainage in the river channel have some influences and the mainstream of Lingdingyang sea area has no significant change after the project completion.The local river bed near the mainstream section of the bridge site has visible erosion after the project completion.Compared with the situation without the project,the thickness of accumulated sediment in ten years at the Lingdingyang beach has increased,but the increase is small;the rate of development at the main beach has increased too,but slightly.The entire configuration of the three beaches and two grooves will be maintained.